JPH0134897Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotation mechanism applied to a seat installed in a vehicle such as an automobile.

[Conventional technology]

Conventional example 1 is shown in FIG. In the figure, reference numeral 1 denotes a lower frame, which includes a base 11 having a raised part 12 formed in the center and a central hole 13 formed in the top 12A of the raised part 12, and the raised part 1 of the base 11.
A flange 15 is attached to the periphery of the central hole 13 by a rivet 14 at the top 12A of the raised portion 12 and the flange 1
5, a fitting groove 16 is formed therebetween. On the other hand, 2 is an upper frame in which a central hole 21 is formed and its peripheral wall 2
The peripheral wall 22 has a tapered shape whose diameter decreases downward, and the lower edge of the peripheral wall 22 is bent inward to form a fitting collar 23. By fitting the fitting collar 23 into the fitting groove 16 of the lower frame 1, the upper frame 2 is rotatably attached to the lower frame 1. A seat is installed on the upper frame 2, and the root end 3 of the seat belt is connected to a bracket 31 located at the edge of the upper frame 2.

Conventional example 2 is shown in FIG. In the figure, an upper frame 2 is rotatably attached to a lower frame 1 with the same structure as the conventional example 1. Further, hooks 4 and 5 are extended from the lower surface of the periphery of the upper frame 2 and the upper surface of the periphery of the lower frame 1, respectively.

[Problem that the invention attempts to solve]

In Conventional Example 1, when a tensile force in the direction of the arrow is applied to the seatbelt root end 3, the point of application of the tensile force is from the bracket 31, which is the connection point of the root end 3A of the seatbelt 3 in the upper frame 2, to the fulcrum, That is, since there is a certain distance between the fitting collar 23 of the upper frame 2 and the position where it is fitted into the fitting groove 23 of the lower frame 1, a moment is applied to the portion of the upper frame 2 during this distance, causing deformation or destruction. easy.

Therefore, as in Conventional Example 2, a structure is provided in which the upper frame 2 is reinforced by engagement of the hooks 4 and 5 near the point of application of the tensile force. However, in such a configuration, the hooks 4 and 5 must be attached to the upper frame 2 and the lower frame 1, respectively, which complicates the structure, increases the number of parts, and requires time and effort to attach.

[Means for solving problems]

As a means to solve the above-mentioned problems, the present invention has an upper frame 2 rotatably mounted on the lower frame 1, and a hook on the periphery of the upper frame 2 that is biased inward and engages with the lower edge of the lower frame 1. The upper edge of a locking piece 41 having a portion 41A formed at the bottom thereof is pivoted.

[Effect]

The operation of the present invention based on the above configuration is as follows.

When an upward pulling force is applied to the periphery of the upper frame while the hook of the locking piece is engaged with the lower edge of the lower frame, not only the upper frame but also the lower frame through the locking piece respond to the tensile force. Antagonize. When rotating the top frame relative to the bottom frame,
Even if the lower frame interferes with the locking piece, the locking piece is pushed by the lower frame and rotates outward, so that rotation of the upper frame is not hindered.

[Effect of idea]

Therefore, in the present invention, the upper frame is reinforced by the lower frame through the locking pieces, so that even if a tensile force is applied to the upper frame by a seat belt or the like, the upper frame is unlikely to be deformed or destroyed. Furthermore, since the locking piece can be attached only to the upper frame, the structure is simple, the number of parts is small, and installation is easy.

〔Example〕

The present invention will be explained with reference to an embodiment shown in FIGS. 1 to 3. In the figure, reference numeral 1 denotes a lower frame, which includes a base 11 having a raised part 12 formed in the center and a central hole 13 formed in the top 12A of the raised part 12, and the raised part 12 of the base 11. top 12 of
A flange 15 is attached to the periphery of the central hole 13 by a rivet 14 at A, and a fitting groove 16 is formed between the top 12A of the raised portion 12 and the flange 15. On the other hand, 2 is an upper frame in which a central hole 21 is formed, and a peripheral wall 22 thereof has a tapered shape whose diameter decreases downward, and a lower edge of the peripheral wall 22 is bent inward to form a fitting collar 23. By fitting the fitting collar 23 into the fitting groove 16 of the lower frame 1, the upper frame 2 is rotatably attached to the lower frame 1. A seat is installed on the upper frame 2, and the root end 3A of the seat belt 3 is connected to a bracket 31 located at the edge of the upper frame 2. Further, a bearing 32 is protruded from the outer surface of the bracket 31, and the bearing 32 is connected to the pair of bearings 4 of the locking piece 41.
2 and 42, and the pivot 43 passes through the bearing 32 and the bearings 42, 42. In this way, the locking piece 41 is pivotally attached to the bracket 31 and urged inward by the spring 44. The hook portion 41A formed at the lower part of the locking piece 41 is attached to the lower frame 1.
engages the lower edge of the

In the above configuration, when the tensile force of the seat belt 3 is applied to the bracket 31, the upper frame 2 via the bracket 31 and the lower frame 1 via the locking piece 41 counteract the tensile force. Furthermore, when the upper frame 2 is rotated relative to the lower frame 1, if the corner of the lower frame 1 hits the inside of the locking piece 41 as shown in FIG. pushed outward against the elasticity of the As a result, rotation with respect to the upper frame 2 and the lower frame 1 is not hindered.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention. Figure 1 is a side sectional view, Figure 2 is a partially exploded perspective view of the locking piece attached, and Figure 3 is a view of the upper frame when it is rotated. FIG. 4 is a side sectional view of the conventional example 1, and FIG. 5 is a side sectional view of the conventional example 2. In the figure, 1...lower frame, 2...upper frame, 41...locking piece.

Claims (1)

[Scope of utility model registration request] An upper frame is rotatably mounted on the lower frame, and the upper edge of a locking piece is pivotally attached to the periphery of the upper frame, and the upper edge of the locking piece is biased inward and has a hook portion formed at the lower part that engages with the lower edge of the lower frame. A seat rotation mechanism characterized by: